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Matena Tunnel at Night, Duisburg, Ruhr Basin, North Rhine-Westphalia, Germany
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Workers talking in micro green underground tunnel nursery, London, UK
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LKAB mining tour, largest underground iron ore mine in the world, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe
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Typical african ladder made from a branch in a house, Gaoua, Poni Province, Burkina Faso
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Businessman and businesswoman alighting train, London Underground, UK
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Business woman texting on platform, Underground station, London, UK
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Sevilla Metro station sign in front of the Banco Espanol de Credito building, Madrid, Spain, Europe
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A train pulls out of a station on the Lyon metro system, Lyon, Rhone, Rhone-Alpes, France, Europe
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Five people standing in a row on a subway platform, waiting in line, Tokyo commuters.
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Furong stalactite cave of the Wulong Karst geological park, UNESCO World Heritage Site in Wulong county, Chongqing, China, Asia
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Female worker updating digital tablet in underground tunnel seed tray nursery, London, UK
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Metro Vancouver SkyTrain tunnel in Vancouver, British Columbia, Canada
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Parque Arquelogico de Yerradentro Alto de Segoria, Terradentro, Colombia, South America
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Japanese Navy WW2 Underground Headquarters, Naha, Okinawa Island, Okinawa Prefecture, Japan
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Underground station entrance, Piccadilly Circus, London, England, United Kingdom, Europe
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businessman working on his digital tablet near the subway station
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Man Peeking Out of Hole in Ground with Pipeline Leading to Storage Tanks in Background
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Bank Underground Station Central Line platform, London, England, United Kingdom, Europe
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Waterfall of River Lison emerging from underground, Source du Lison, Nans sous St. Anne, Jura, Franche Comte, France, Europe
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Victorian signage points the way out of Camden Town station on the Northern Line of the London Underground, Camden Town, London, England, United Kingdom, Europe
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Japanese Navy WW2 Underground Headquarters, Naha, Okinawa Island, Okinawa Prefecture, Japan
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Underground station entrance, Piccadilly Circus, London, England, United Kingdom, Europe
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Mind the gap warning painted on the edge of the subway platform in the London Underground
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Bank Underground Station Central Line platform, London, England, United Kingdom, Europe
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View of well from inside Berber underground dwellings, Matmata, Tunisia, North Africa, Africa
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Sheikh Zayed Road skyline of high rise buildings and skyscrapers, and metro train, Dubai City, United Arab Emirates, Middle East
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Young woman sitting on underground station stairway looking at smartphone
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Underground station sign and Big Ben, Westminster, London, England, United Kingdom, Europe
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Three people, two women and man, sitting side by side on a subway train, Tokyo commuters.
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MIND THE GAP sign on platform edge, London Underground, London, England, United Kingdom, Europe
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Short haired young woman moving down underground station escalator looking at smartphone
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Jubilee Line train at Southwark Station, London, England, United Kingdom, Europe
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Australia, South Australia, Coober Pedy. The lunar-like landscape of Coober Pedy - an outback town built mostly underground.
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Man talking on mobile phone while charging electric car in garage
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Interior, Berber underground dwellings, Matmata, Tunisia, North Africa, Africa
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Male foreman with headlamp using walkie-talkie at dark construction site
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Female worker cleaning equipment in underground tunnel nursery, London, UK
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View of London Underground Platform at Edgware Road with Train Leaving, London, England, UK
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Granaries (ghorfas) and troglodyte dwellings at hillside Berber village of Chenini, Tunisia, North Africa, Africa
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Two young women moving up underground station escalator looking at smartphone
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Three people sitting sidy by side on a subway train, Tokyo commuters.
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Escalators to the MetLife Building, Grand Central Station, New York City, New York, USA
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